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Sauce

Onion Sauce

A sauce made by boiling onions until tender and mixing them with plain white sauce or melted butter.

From an old cookbook · modernised transcription
From a historical cookbook (Internet Archive) · 2 ingredients
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Why it works: Onion and sauce are a kitchen classic. They rank in the top 19% of all ingredient pairs, and cooks put them together in 10,474 recipes. Both carry ethanol, which smells alcoholic, ethereal. The science ↓

Onion Sauce

Ingredients

Directions

Prepare the onions

  1. Blanch the onions by placing them in cold water and bringing it to a boil.

  2. Discard the water and place the onions in fresh water.

Cook and finish

  1. Boil the onions for 1 to 1.5 hours until tender.

  2. Chop the onions finely and add them to the sauce or melted butter.

Recipe from a historical cookbook (Internet Archive).

Transcribed from a scanned cookbook and modernised for today's kitchens. Where the book gave no heat or time, or said "a moderate oven", the temperatures and times here may be modern equivalents rather than the book's own figures.

Explore the science

The flavor team

The pairs that carry this dish. Each one is judged two ways: how much their aromas overlap, and how often cooks already put them together.

  1. Onion + saucetop 19% of all pairs
    Smell alikelow
    Cooked together10,474 recipes

    Shared aroma: ethanol (alcoholic, ethereal).

Onion and sauce barely smell alike, yet cooks put them together in 10,474 recipes: they work on texture and structure more than aroma.

Ranks compare each pair with 20,000 random ingredient pairs on CompKitchen. How we score pairs

What each ingredient does

Onions
Become tender and sweet during long boiling, then give the sauce its main flavor and body.
Plain white sauce
Forms the creamy base that carries the chopped onions.
Melted butter
Adds richness and a smooth, fatty mouthfeel to the onions.

The step that matters

Boil the onions for 1 to 1.5 hours until tender. Onions contain sulfur compounds that turn sharp when cooked briefly. Long, gentle boiling breaks down their structure and sugars, making them soft and mild. Stopping early leaves them firm and harsh-tasting.

“What each ingredient does” and “The step that matters” were written by Claude from this recipe’s own method and reviewed in samples by CompKitchen.

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